SUPERFICIAL DISSECTIONS 17 



metacarpi externus muscles. This branch ramifies on the external and 

 anterior aspects of the knee (29). 



The 'External Plantar Nerve (37). — Below the knee this nerve is 

 seen on the edge of the perforans tendon. It follows the course 

 of the tendon down the limb, behind the vein and artery already 

 described. Just above the level of the button of the splint bone 

 it receives a communicating branch from the internal plantar nerve 

 which winds round to the outer side behind the tendon of the flexor 

 perforatus (41). 



At the fetlock the nerve gives off its anterior digital branch (40), 

 which crosses the digital artery and vein, and runs obliquely downwards 

 and forwards alongside the corresponding branch of the suspensory 

 ligament. It is distributed to the coronary cushion. 



The plantar nerve then divides into the middle and posterior digital 

 nerves. The former crosses the digital artery and is distributed to the 

 coronary cushion and sensitive lamina, whilst the latter continues 

 its downward course, to be ultimately distributed to the sensitive 

 laminae and the pedal bone. 



INNER ASPECT OF LIMB (Plates VI. and VII.) 

 The Bones 



At the inner aspect of the shoulder joint the anterior and posterior 

 divisions of the inner tuberosity of the humerus are visible. Owing to 

 the flexion of the elbow, the coraco-humeralis and biceps muscles are 

 displaced slightly forwards, with the result that a considerable portion of 

 the inner lateral aspect of the shaft of the humerus is visible, along 

 which numerous vessels and nerves are seen to run. 



The anterior part of the internal condyle of the humerus is exposed 

 and the posterior part is concealed by the origin of the flexor muscles 

 of the metacarpus and digit. 



c 



